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Amino Acids and Peptides. Part 19. Synthesis of β-1-and β-2-Adamantyl Aspartates and their Evaluation for Peptide Synthesis
Okada, Yoshio,Iguchi, Shin
, p. 2129 - 2136 (2007/10/02)
β-1-and β-2-Adamantyl aspartates have been synthesized and their properties examined.Altough the 1-Ada group is labile to TFA, the 2-Ada group is unaffected during TFA treatment, but easily removable by methanesulphonic acid (MSA) at room temperature within 5 min.Both groups are unaffected by treatment with 55percent piperidine under conditions which easily cleave the fluoren-9-ylmethoxycarbonyl (Fmoc) group from α-amino group.Both groups can suppress aspartimide formation as a side reaction under acidic and basic conditions during the synthesis of aspartyl peptides. β-1-or β-2-Adamantyl aspartates may be applicable to solid-phase peptide synthesis in combination with Fmoc or Boc as an Nα-protecting group, respectively.Some properties of the aspartimide moiety are described.
